docs: fix north eap docs yaml blocks

[miguelvr]

This PR makes changes to the installation process for a POC install.

• The helm.cohere.com domain is now only required during installation, but not in the cluster's firewall.
• The api.cohere.com domain is now only required if using the Cohere platform as the model provider.
• The global.config.postgres.tls.caCerts.secretName and global.config.postgres.tls.caCerts.secretKey flags have been removed from the installation command.
• The global.config.redis.host, global.config.redis.tls.caCerts.secretName, and global.config.redis.tls.caCerts.secretKey flags have also been removed from the installation command.
• The global.config.redis.scheme and global.config.redis.connectionOptions flags have been updated to use the rediss scheme and connection options.
• The global.config.cohere.apiKey.secretKeyRef.name and global.config.cohere.apiKey.secretKeyRef.key flags have been added to the installation command.
• The models.enabled flag has been set to false.
• The toolkit.config.modelDeploymentType flag has been set to cohere_platform.

[github-actions]

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[trentfowlercohere]

:)